IF and modulo axes

[Patrick Joeckel <joeckel@xxxxxxxxxxxxxxxxx>]

Dear FERRETers,

can anybody help me with the following problem:

I want to mask out a certain region using the 'IF ... THEN ... ELSE ...'
structure of ferret (V5.22 on Dec-Alpha OSF 4.0f). However, this does not 
seem to work with modulo axes.
In the following example

define axis/x=0:359:1/modulo/unit=longitude lon
define axis/y=-90:90:1/unit=latitude lat
let A = IF ((X[gx=lon] GE -10) AND (X[gx=lon] LE 10) AND (Y[gy=lat] GE -10) 
AND (Y[gy=lat] LE 10)) THEN 1 ELSE 0
shade A

I would expect the box to be also drawn  from 350 to 360 degrees longitude.
This is not the case! Is there a work-around, or are there plans for a future
release to make IF ... THEN ... ELSE work also for modulo axes.

Sincerely,

      Patrick Joeckel


-- 
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Dr. Patrick Joeckel
Max Planck Institute for Chemistry
Joh.-J. Becher Weg 27         
55128 Mainz                   phone:++49-6131-305452      
Germany                       fax  :++49-6131-305436     
                             e-mail:joeckel@mpch-mainz.mpg.de
                         http://www.mpch-mainz.mpg.de/~joeckel
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Never trust an operating system you don't have sources for.